25224220 has 48 divisors (see below), whose sum is σ = 61790400. Its totient is φ = 8645952.

The previous prime is 25224217. The next prime is 25224223. The reversal of 25224220 is 2242252.

It is an interprime number because it is at equal distance from previous prime (25224217) and next prime (25224223).

It is a super-2 number, since 2×25224220² = 1272522549216800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25224223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5022 + ... + 8698.

It is an arithmetic number, because the mean of its divisors is an integer number (1287300).

Almost surely, 2^25224220 is an apocalyptic number.

25224220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25224220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30895200).

25224220 is an abundant number, since it is smaller than the sum of its proper divisors (36566180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25224220 is a wasteful number, since it uses less digits than its factorization.

25224220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707 (or 3691 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 25224220 is about 5022.3719495872. The cubic root of 25224220 is about 293.2733377069.

Adding to 25224220 its reverse (2242252), we get a palindrome (27466472).

The spelling of 25224220 in words is "twenty-five million, two hundred twenty-four thousand, two hundred twenty".